400400407 has 4 divisors (see below), whose sum is σ = 436800456. Its totient is φ = 364000360.

The previous prime is 400400389. The next prime is 400400437. The reversal of 400400407 is 704004004.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400400407 - 2¹¹ = 400398359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400400437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18200008 + ... + 18200029.

It is an arithmetic number, because the mean of its divisors is an integer number (109200114).

Almost surely, 2^400400407 is an apocalyptic number.

400400407 is a deficient number, since it is larger than the sum of its proper divisors (36400049).

400400407 is a wasteful number, since it uses less digits than its factorization.

400400407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36400048.

The product of its (nonzero) digits is 448, while the sum is 19.

The square root of 400400407 is about 20010.0076711629. The cubic root of 400400407 is about 737.0520697397.

The spelling of 400400407 in words is "four hundred million, four hundred thousand, four hundred seven".